Brake.



Patented july 29, |92.

e;j w. STEVENS.

B RA K E.

(Application led Dec. 5, 1901.)

l(no Model.;

WITNESSES [N VEN T 0R ffw.

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UNITED STATES PATENT EEICE.

GEORGE w..sTEvENs, OE BOSTON, MASSACHUSETTS.

B RAKE'.

SPECIFICATION forming part of Letters Patent No. 705,623, dated J' uly29, 1902.

Application mea December 5, 1901. serial No. 84,782. ein model.)

To all wiz/0m t may concern,.-

Be it known that L'GEOEGE W. STEVENS, a citizen of the UnitedStates,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Brakes; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to brakes for steamengines and other motors ormachines which sometimes run too fast; and it consists in the novelconstruction and combination of the parts hereinafter fully describedand claimed.

In the drawing the figure is a diagramshowing a sectional side view ofthe brake mechanism.

`A is the crank-shaft of a steam-engine or other motor or machine, and Bis the ilywheel secured on it.

C is a brake-Wheel secured on the shaft A, and this wheel may also beits driving-belt pulley. I

D is a brake supported by abrake-lever d,

which is pivoted at one end to any stationary speed-governor itself isof any approved con struction, and g is avalve in the supply-pipe Fwhich is opened by the vgovernor when the said governor exceeds aprearranged speed.

II is a pipe which leads out of the cylinder E, and??I is a valve in thepipe H, which is closed by the governor whenever the valve g is opened.i

When the engine loses its load and runs too fast, the governor opens thevalve g, and the brake is pressed against the brake-wheel. Vhen theengine returns to its normal speed, the governor closes the valve g andopens the valve h, which lets all the pressure remaining in thecylinderpass out of it, so that the brake is thrown entirely out ofaction.

What I claimis-J- The combination, with a brakeewheel, and a pivotedbrake-lever provided with a brake for bearing against the saidbrake-wheel; of a cylinder provided with a piston and a pistonfrod foroperating the brake-lever, an inlet-valve and an outlet-valve connectedwith the said cylinder, and a speed-governor operatively connected withthe said brake-wheel and operating to open the inlet-valve and close theoutlet-valve when the brake-wheel is revolved too quickly, substantiallyas set forth.

In testimony whereof I ax my signature in presence of two witnesses.

GEORGE W. STEVENS.

Witnesses:

ALICE J. MUEEAY, FEED. K. IDAeeETT.u

